I push for electronic payments until they happen without fail.

Kids will be attached to their personal electronics anyway.A Foosball or Pool Table makes more sense for a loft.I like the board game idea.

Document the days and the hours and the noise level as measured electronically.

If it were me I’d pick up rent or have the tenant send electronically and until they missed a payment they would be on auto-pilot.

I recommend you do the same unless you want to encourage this tenant that it is okay to make their problems into your problems.For the future, consider requiring ACH/auto-debit/Zelle or some other form of automated/electronic payment so "I couldn't get to the bank" is no longer a factor.

But I feel like I read that electronic communication was not useable for legal notice i.e. 30-60 day, 3 day pay or quit ECT. 

After that, you can collect the subsequent month's rent however your lease allows (personal check, electronic transfer, etc). 

Your tenant moved out on Jan 5th.Now, they thought they'd want to stay until Jan 12th, but ended up able to move in the 30 days that would have been required.It doesn't really matter if electronic notice is valid or not, the law still requires the tenant to provide a minimum of 30 days advance notice.

We used HelloSign to get the lease signed electronically.  

I went the free and easy way for electronic rent payments.